Valera Corporation makes a product with the following standards for labor and variable overhead: Standard Quantity Standard Price or Standard Cost Per Rate Unit $8.40 $2.40 or Hours Direct labor Variable overhead 0.4 hours 0.4 hours $21.00 per hour 6.00 per hour The company budgeted for production of 5,300 units in July, but actual production was 5,400 units. The company used 2.130 direct labor-hours to produce this output. The actual variable overhead rate was $6.10 per hour. The company applies variable overhead on the basis of direct labor-hours. The variable overhead efficiency variance for July is